Determine current keyboard type in iOS 10 and iOS 9

UISearchBar+DetermineKeyboardType.m

//
//  UISearchBar+DetermineKeyboardType.m
//
//  message [self.searchBar determineKeyboardType] to retreive current keyboard type
//
//  Problem is explained here: http://tech.ustwo.com/2014/05/29/ios-uikeyboardtype-issue/
//  Most of the code is copied from https://github.com/martinstolz/UIKeyboardType-Fix-Demo
//  few modification made to support iOS 10 && 9
//

#import "UISearchBar+DetermineKeyboardType.h"
#import <objc/message.h>

@implementation UISearchBar (DetermineKeyboardType)

- (UIKeyboardType)determineKeyboardType
{
    UIWindow *keyboardWindow = [self keyboardWindow];
    NSString *componentName = nil;

    if(keyboardWindow)
        [self getComponentName:keyboardWindow.subviews componentName:&componentName];

    UIKeyboardType keyboardType = [self mapComponentNameToKeyboardType:componentName];

    return keyboardType;
}

- (UIWindow *)keyboardWindow
{
    UIWindow *keyboardWindow = nil;
    NSArray *windows = [UIApplication sharedApplication].windows;
    for (UIWindow *window in windows)
    {
        if ([window.class isEqual:NSClassFromString(@"UIRemoteKeyboardWindow")])
        {
            keyboardWindow = window;
            break;
        }
    }

    return keyboardWindow;
}

- (UIKeyboardType)mapComponentNameToKeyboardType:(NSString *)componentName
{
    UIKeyboardType keyboardType = 0;

    if (componentName) {
        NSNumber *value = [[self mapDictionary] valueForKey:componentName];
        if (value)
        {
            keyboardType = [value intValue];
        }
    }
    return keyboardType;
}

- (NSDictionary *)mapDictionary
{
    return  @{
              @"Capital-Letters": @(UIKeyboardTypeASCIICapable),
              @"Small-Letters": @(UIKeyboardTypeASCIICapable),
              @"First-Alternate": @(UIKeyboardTypeASCIICapable),
              @"Numbers-And-Punctuation": @(UIKeyboardTypeNumbersAndPunctuation),
              @"Numbers-And-Punctuation-Alternate": @(UIKeyboardTypeNumbersAndPunctuation)
              };
}

- (void)getComponentName:(NSArray *)array componentName:(NSString **)componentName
{
    for(int i = 0; i < array.count; i++)
    {
        if([array[i] isKindOfClass:[UIView class]])
        {
            UIView *view = (UIView *)array[i];

            if ([NSStringFromClass(view.class) isEqualToString:@"UIKBKeyplaneView"])
            {
                SEL keyplaneSelector = NSSelectorFromString(@"keyplane");
                if ([view respondsToSelector:keyplaneSelector])
                {
                    NSObject *keyplane = ((NSString *(*)(id, SEL))objc_msgSend)(view, keyplaneSelector);
                    if (keyplane.class == NSClassFromString(@"UIKBTree"))
                    {
                        SEL componentNameSelector = NSSelectorFromString(@"componentName");
                        NSString *name = ((NSString *(*)(id, SEL))objc_msgSend)(keyplane, componentNameSelector);
                        *componentName = name;
                        return;
                    }
                }
            }
            else
            {
                [self getComponentName:[view subviews] componentName:componentName];
            }
        }
    }
}

@end